Piston-ring



M. B. SETTER.

PISTON RING.

APPLICATION FILED AUG. so. 1918.

mm, 1580 Patented uly 12, 19211.

iij

PISTON-RING.

1,384hil58,

Application filed August 30, 1918.

To all 10 7mm it may concern Le it known that l, Mioimicn ll. .Elrrrrnn,a citizen of the ilnitcd Shtes of America, and a resident of Chicago,illinois, have inventd a certain new and useful .l nprove nient inPiston-hinge, or 7 oh. the followinn is a specification.

This invention relates to split use on pistons, or for other purposes,but nore particularly to those which a lap joint where the two endportions of the ring); engage each other.

Generally stated, the object of the invention is to provide a novel andimproved tormation of the lap joint in the ring, with a view topreventingleakage and making the cmistruction of the ring stronger, sothat breakage will be less liable to occur, and whereby rings of thiskind may be manufactured at a comparatively small cost of p; oduction.

lit is also an object to provide certain details and features ofconstruction tending to increase the general efiiciency andserviceability of a piston ring of this particular character.

To these and other useful ends the invention consists in mattershereinafter set forth and claimed.

in the accompanving: drawings Figure l is a plan oi a piston ringinvolving; the principles of the invention.

2 is a side elevation or or go view of said is an enlarged plan of thela ioint is a section on line in Fig, 8. 1s

a perspective or the two engago ring. As thus illustrated, the inventioncoinorises a ring; 1 which is sol t a i one side to ovide two endportions. @ne i-nd. portion is provided with an inner wall 2 which isrounded at end 3, and which is rounded at l where it the shoulder orVertical edge corner 5, which latter i. disposed a suitable distancefrom the rounded end portion 3 of the ring. A top wall 6 overhangs therounded surface l and the shoulder or corner 5, and it will be seen thatthe ledge or overhanging portion formed by this top wall 6 is of lessthickness or height than the shoulder 5, the latter occupyingSpecification of Letters Patent.

Patented July 12, 19.21.

$eria1 210. 252,086.

about two-thirds of the thickness the of the ring. Also, this top wall 6is only about half as long as the wall 2, so that a staight shoulder '7is formed about midway between the ends of the wall whereby the latterextends some distance beyond said top wall. Preferably, the ring is whatis ordinarily called an eccentric ring.v being thicker at its site 8than it is at the points 9 and 10 at opp: "to sides of the lap joint, sothat terminates in a rounded shoulder 11 at the inner side of the ring,and in effect 0' e wall 2 i offset inwardly relatively to the innercircumference of the ring.

The other end portion of the ring has an outer wall 12 which has its endrounded at 13 to fit the rounded surface 4: of the other end portion,and which is rounded at i l to fit the rounded end of said other endportion of the 3 whereby a lap j int is formed between the walls 2 and12, this lap joint being practically fiat and disposed in a verticalplane, when the engine is disposed vertically, and said lap joint beingrounded at its opposite ends, so that a rounded shoulder or butt jointis termed at each end of said lap joint. In addition, it will be seenthat a portion of the upper edge of the wall 12 is cut away to form ahorizontal top surface 15 which engages the bottom of the top wall 6,thereby to provide a lap joint in a horizontal plane, and to provide avertical shoulder 16 tor engagement with the shoulder '7 previouslydescribed, and in this way a butt joint formed between the shoulders 7and 16, with square corners. The plane of the lap joint the top formedbetween the under side owall (3 and the upper surface 15 is hori-Frontal, pret'erably, and the ring itself is disposed in this plane, sothat the two lap joints are in planes at right angles to each other, andone lap joint is only about half as lonc; as the other. The wall 12 isproton ably thicker than the wall 2, and the forination of the roundedshoulder 14 makes the ring thicker at 17 than it is at 9, and thisthickened portion or inner projection 17 has its inner surface 18disposed a little inside of the inner surface 19 of the wall 2, so thatwhen the ring is in use the surface 18 will bear against the bottom ofthe seat in the piston, while there will be a slight space between thesurface 19 and the said bottom surface of the seat or groove of thepiston, whereby the end portion of the ring which has the wall 2 canspring inward a little when the ring is in use. At its other side theportion 17 is preferably rounded at 20, in the manner shown in thedrawings.

The construction and formation of the ring not only facilitates themanufacture thereof, but also makes the ring stronger and less liable tobreak under the strain of explosions in the internal combustion engine,or under the strain of the pressure in any engine or motor or pump, orother structure in which it may be employed, although the ring' is moreparticularly adapted for use in an internal combustion engine. The curve4 eliminates a sharp corner between the wall 2 and the shoulder 5, andnot only facilitates the manufacture of the ring, but also serves toprevent the possibility of fracture at this point. It will be understoodthat a fracture usually occurs where a sharp cornered recess is formed,the corner being the startingpoint of the fracture;

but with the provision of the curved surface 1, such fracture is notliable to occur. This is also true, in the same way, of the curve at 14,as no fracture is liable to start or occur at this point, and forsimilar reasons the curves at 11 and 20 tend to preclude a fracture atthese points. The location of the butt joint formed between theshoulders 7 and 16 tends to prevent leakage, and the relativearrangement of all of the lap joints and butt joints is such as toinsure against leakage. V

The ring can be used upside down, of course, or in such a position thatits lower side 21 will be toward the pressure in the cylinder of theengine, or may be applied so that its upper side 22 will be toward theexplosion chamber of the cylinder. Ordinarily, automobile engines arearranged vertically, and in such case the lap joint at 23, formedbetween the bottom of the wall 6 and the top surface 15, will behorizontal,

while the lap joint 24, formed between the flat or substantially flatmeeting surfaces of the walls 2 and 12, will be disposed substantiallyin a vertical plane.

Thus the rounded shoulders 5 and 13' provide a butt joint 25 which formsa straight line 26 extending transversely of the outer circumference ofthe ring, while the butt joint 27 between the surfaces 3 and let forms astraight line 28 extending transversely of latter, as previouslyexplained, serves to space the .inner surface lf) of the wall 2 adistance from the bottom of the groove in the piston. In practice thistends to prevent breakage of the inner wall 2, as the pressure of theexplosions is not exerted against the joint in a way which would beliable to cause such breakage, or breakage of the other portions, andconsequently the construction tends to preclude trouble of thischaracter.

What I claim as my invention is 1. The combination, in a piston ring ofinner and outer end portions which are curved The at their respectiveends (3 and 13) and which are shaped to overlap one upon the other, sothat two lap joints are formed in planes at an angle to each other, withonelap joint substantially longer than the other, the

shorter lap joint being disposed in a plane between the two flat sidesof the ring and terminating in a butt joint between the two curved ends(3 and 13) ,and an inwardly projecting portion (18) which is rigid withsaid outer end portion and which projects inwardly beyond the innersurface of said outer end portion.

2. A.- one-piece piston ring formed with eccentric inner and outeredges, with a lap joint in thefrelatively thin side of the ring, whichjoint is formed by innerand outer end portions, and said outer endportion having means projecting inwardly beyond the inner surface of thesaid inner end portion.

3. A structure as specified in claim 2, said inwardly projecting meanscomprising a' lug (18) which is rounded at one side to engage said innerend portion.

MICHAEL B. snr'rna

